Related Words

Twilight Zone: See Mesopelagic Zone.

Mesopelagic Zone: Also called the 'twilight zone' of the ocean, this area from 200m to 1000m in depth, is bordered by the photic zone above and darkness below. It's in this zone where you start to see biolumi . . . View Full Definition

Surf Zone: An area of breaking waves bounded by the point of first breakers, then landward to the maximum uprush of waves on the beach.

Target Heart Rate Zone: The number of heartbeats per minute reflecting the exercise intensity that gains the maximum training benefits from an aerobic workout. The formula for obtaining a target heart rate equals 2 . . . View Full Definition

Sunlight Zone: See Photic Zone.

Twilight: Often called dusk, it is the evening period of waning light from the time of sunset to dark. The time of increasing light in the morning is called dawn. Twilight ends in the evening or begin . . . View Full Definition

Vadose Zone: The region in the ground between the surface and the water table in which pores are not filled with water. Also called the unsaturated zone.

Twilight Rate: A discounted green fee based on the fact that a limited number of holes may be completed due to darkness

Subduction Zone: An area at a convergent plate boundary where an oceanic plate is being forced down into the mantle beneath another plate. These can be identified by a zone of progressively deeper earthquakes.

Target Zone Arrangement: In the context of takeovers, the price at which an acquirer aims to buy a target firm. In the context of options, the price of the underlying security at which an option will become in the m . . . View Full Definition